/* roulang page: index */
/* 自定义 CSS 变量与全局重置 */
    :root {
      --primary-dark: #8B6914;
      --primary-light: #D4AF37;
      --secondary-bg: #F5F0E8;
      --deep-charcoal: #1E1E1E;
      --accent-red: #7B2D3B;
      --success-green: #2D5A27;
      --text-title: #1E1E1E;
      --text-body: #3A3A3A;
      --text-muted: #6B6B6B;
      --card-white: #FFFFFF;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.06);
      --shadow-lg: 0 16px 40px rgba(0,0,0,0.08);
      --radius-xl: 16px;
      --radius-2xl: 24px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: #FBF9F6;
      color: var(--text-body);
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }

    /* 容器与排版 */
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 2rem;
    }

    h1, h2, h3, h4 {
      color: var(--text-title);
      font-weight: 600;
      letter-spacing: -0.01em;
    }

    h2 {
      position: relative;
      display: inline-block;
      margin-bottom: 2.5rem;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -12px;
      width: 60px;
      height: 4px;
      border-radius: 4px;
      background: linear-gradient(to right, var(--primary-dark), var(--primary-light));
    }

    /* 导航双层系统 */
    .nav-tab-pill {
      transition: all 0.2s ease;
      white-space: nowrap;
      cursor: pointer;
    }
    .nav-tab-pill.active {
      background-color: var(--primary-dark);
      color: white;
      box-shadow: 0 4px 12px rgba(139,105,20,0.3);
    }
    .mobile-menu-open .nav-second-row {
      display: flex;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 70px;
      left: 0;
      width: 100%;
      padding: 1rem;
      box-shadow: var(--shadow-lg);
      border-radius: 0 0 16px 16px;
    }

    /* 卡片动效 */
    .hover-lift {
      transition: transform 0.3s ease, box-shadow 0.3s ease, border 0.2s;
    }
    .hover-lift:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(139,105,20,0.2);
    }

    /* 渐隐分割线 */
    .gradient-divider {
      height: 1px;
      background: linear-gradient(to right, rgba(139,105,20,0.1), rgba(212,175,55,0.2), rgba(139,105,20,0.1));
      margin: 0 auto;
    }

    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(to right, #8B6914, #D4AF37);
      color: white;
      font-weight: 600;
      padding: 0.9rem 2.2rem;
      border-radius: 9999px;
      box-shadow: 0 8px 18px rgba(139,105,20,0.25);
      transition: all 0.3s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      box-shadow: 0 12px 24px rgba(139,105,20,0.4);
      filter: brightness(1.08);
      transform: scale(1.03);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid #8B6914;
      color: #8B6914;
      font-weight: 600;
      padding: 0.85rem 2rem;
      border-radius: 9999px;
      transition: 0.25s;
    }
    .btn-secondary:hover {
      background: #8B6914;
      color: white;
    }

    /* 数据徽章 */
    .stat-badge {
      font-size: 2.4rem;
      font-weight: 800;
      background: linear-gradient(135deg, #8B6914, #D4AF37);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(139,105,20,0.15);
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 0.8rem;
    }

    /* 移动端横向滚动tabs */
    .tabs-scroll {
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
      white-space: nowrap;
    }
    .tabs-scroll::-webkit-scrollbar {
      display: none;
    }

    @media (max-width: 768px) {
      .container-custom {
        padding: 0 1.2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
      .stat-badge {
        font-size: 2rem;
      }
    }